JP4082599B2 - Wiring harness variation prediction method, apparatus and program thereof - Google Patents

Description

  The present invention relates to a method and an apparatus for predicting a variation range caused by a dimensional tolerance, a restraining method, and the like in order to support a more accurate route design for a wire harness arranged in a vehicle or the like.

  Normally, various electrical components are mounted on a vehicle, etc., and these are connected by a wire-like structure called a wire harness in which a plurality of electric wires and communication lines are bundled with an insulation lock or tape. The This wire harness is usually route designed in consideration of the shape of the vehicle door and body to which it is routed or installed, the presence of electrical components, etc., and the placement on the wire harness assembly jig plate. The

  However, the wire harness that is designed in this way and attached to a predetermined part may cause an unexpected problem after attachment. That is, the wire harness has a characteristic wire length, wire diameter, weight, elasticity, rigidity and the like as is well known, and has material characteristics similar to a kind of elastic body. In addition, there are various restraint positions and restraint directions by restraint members such as clamps, and there are dimensional tolerances at the time of design.

  Therefore, after assembly, due to gravity, engine drive, vibration during travel, and the like, actually, variation or displacement occurs within a certain range from the mounted state. Due to such variations, it is conceivable that the wire harness interferes with parts and electrical parts that were not anticipated at the time of design, causing problems such as damage, and a more accurate route design is required.

Therefore, in view of the above-mentioned present situation, the present invention predicts a variation range indicating a variation or displacement from a mounted state of the wire harness without requiring a complicated calculation, and enables a highly accurate wire harness path design. It is an object to provide a method, an apparatus thereof, and a program thereof.

The wire harness variation prediction method according to claim 1, which has been made in order to solve the above-mentioned problem, is arranged with respect to a predesigned basic route of a wire harness routed to a predetermined part. A method of predicting a variation range indicating a variation or a range of displacement with respect to the basic route of the wire harness generated due to a dimensional tolerance or a restraining method of the wire harness after being sought, and at least different 2 in the basic route Based on the respective restraining positions and restraining directions of the two restraining members restraining the points, the path length indicating the length of the actual path including the dimensional tolerance in the basic path located between the two restraining members is calculated. And the bending portion of the actual path is the minimum bending half based on the path length and the minimum bending radius of the wire harness. And two predicted paths in which the bent portion is closest to the two restraining members, respectively, a start point and an end point are obtained based on the bent portions of each of the predicted paths, and the start point includes the start point and the end point. A calculation point obtaining step for obtaining a plurality of calculation points for calculating the variation range by dividing between the calculation point and the end point, and a peak point when each of the plurality of calculation points is bent at the minimum bending radius An outermost point calculation step for calculating the outermost point of each of a plurality of predicted paths, and a variation range calculation step for calculating the variation range between the two restraint members, and the outermost point calculation step. Table stereoscopically displaying a and the variation range has a connecting display step of sequentially connected by displaying the outermost points each other to close among the obtained plurality of outermost point Te And having a step.

  According to the first aspect of the present invention, the range of variation of the basic path between the restraining members is calculated based on the path length of the basic path designed in advance, each restraining position and restraining direction of the restraining member, and the minimum bending radius. Since this range is displayed three-dimensionally, the suitability of this basic route can be determined intuitively and accurately. Further, by using the minimum bending radius, it is possible to predict realistic variation without requiring complicated calculation.

In addition, a plurality of calculation points for calculating the variation range are obtained based on the two predicted paths closest to the restraining member, the outermost points of the respective predicted paths with respect to these calculated points are calculated, and the proximity Since the outermost points to be displayed are sequentially connected and displayed, the predicted variation range is displayed in a birdcage shape, and the visibility is good.

The wire harness variation prediction method according to claim 2, which has been made in order to solve the above-described problem, is the composite harness display method according to claim 1 , wherein the wire harness variation prediction method is combined with a shape of an attachment site or an interference object and displayed. The method further includes a step.

According to the second aspect of the present invention, the shape of the attachment part and the interference object are combined and displayed, so that a more realistic wire harness path design is possible.

The wire harness variation prediction method according to claim 3, which is made to solve the above-described problem, is the wire harness variation prediction method according to claim 1 , wherein the wire harness is routed to a door or a body of a vehicle. It is characterized by that.

According to the third aspect of the present invention, it is possible to design a route that avoids the adverse effects of the vehicle door and body on the wire harness due to the vibrations peculiar to the vehicle.

The wire harness variation prediction apparatus according to claim 4, which has been made in order to solve the above-described problem, is arranged with respect to a predesigned basic path of a wire harness routed to a predetermined portion. A device for predicting and outputting a variation range indicating a variation or a range of displacement with respect to the basic path of the wire harness generated due to a dimensional tolerance of the wire harness or a restraining method after being sought, Input means for inputting the path length of the basic path, the respective restraining positions and restraining directions of two restraining members that restrain at least two different points in the basic path, and the minimum bending radius of the wire harness; and the restraining position And based on the restraining direction, the basic path located between the two restraining members includes a dimensional tolerance. Based on the path length indicating the length of the actual path, and the path length and the minimum bending radius of the wire harness, the bending portion of the actual path becomes the minimum bending radius and the bending portion is the 2 The two predicted paths closest to each of the two restraining members are calculated, the start point and the end point are obtained based on the bent portions of each of these predicted paths, and the start point and the end point are divided and divided between the start point and the end point. A calculation point obtaining means for obtaining a plurality of calculation points for calculating the variation range, and a plurality of predicted paths that are peak points when each of the plurality of calculation points is bent at the minimum bending radius. a variation range calculation means for calculating the variation range between the outermost point calculation means includes a, an and the two restraining members for calculating the outer points, the outermost point meter Sterically the variation range that is calculated by and the variation range calculation means has a connecting display means for sequentially connecting by displaying the outermost points each other to close among the obtained plurality of the outermost point at step And a variation range display means for displaying.

The wire harness variation prediction program according to claim 5, which has been made in order to solve the above-described problem, is based on a predesigned basic path of a wire harness routed to a predetermined portion. In order to predict and display a variation range indicating a variation range or a displacement range with respect to the basic route of the wire harness generated due to a dimensional tolerance or a restraining method of the wire harness after being routed to a computer, Input means for inputting the path length of the basic path including the dimensional tolerance, the respective restraining positions and restraining directions of two restraining members that restrain at least two different points in the basic path, and the minimum bending radius of the wire harness; Based on the restraint position and the restraint direction, before being positioned between the two restraint members Based on the means for calculating the path length indicating the length of the actual path including the dimensional tolerance in the basic path, and based on the path length and the minimum bending radius of the wire harness, the bent portion of the actual path becomes the minimum bending radius. And the two predicted paths in which the bent part is closest to the two restraining members are calculated, a start point and an end point are obtained based on the bent parts of each of the predicted paths, including the start point and the end point, and from the start point Calculation point acquisition means for obtaining a plurality of calculation points for calculating the variation range by dividing between end points, and a plurality of peak points when each of the plurality of calculation points is bent at the minimum bending radius each variation range to calculate the variation range between the outermost point calculation means includes a, an and the two restraining members for calculating the outermost point of the predicted path of the Calculation means, the calculation in and the variation range calculation means has a connecting display means for sequentially connecting by displaying the outermost points each other to close among the obtained plurality of the outermost point at the outermost point calculating step It is made to function as a variation range display means which displays the said variation range displayed three-dimensionally.

According to the fourth and fifth aspects of the present invention, the variation range of the basic path between the restraining members based on the input path length of the basic path, the restraining position and restraining direction of the restraining member, and the minimum bending radius. Since this range is displayed in a three-dimensional manner, the suitability of the basic route can be easily determined as appropriate. Further, by using the minimum bending radius, it is possible to predict realistic variation without requiring complicated calculation. In addition, a plurality of calculation points for calculating the variation range are obtained based on the two predicted paths closest to the restraining member, the outermost points of the respective predicted paths with respect to these calculated points are calculated, and the proximity Since the outermost points to be displayed are sequentially connected and displayed, the predicted variation range is displayed in a birdcage shape, and the visibility is good.

  According to the first aspect of the present invention, the range of variation of the basic path between the restraining members is calculated based on the path length of the basic path designed in advance, each restraining position and restraining direction of the restraining member, and the minimum bending radius. Since this range is displayed three-dimensionally, the suitability of this basic route can be determined intuitively and accurately. Therefore, it is possible to design the wire harness path with high accuracy in a short period of time. Further, by using the minimum bending radius, it is possible to predict realistic variation without requiring complicated calculation.

In addition, a plurality of calculation points for calculating the variation range are obtained based on the two predicted paths closest to the restraining member, the outermost points of the respective predicted paths with respect to these calculated points are calculated, and the proximity Since the outermost points to be displayed are sequentially connected and displayed, the predicted variation range is displayed in a birdcage shape, and the visibility is good. Therefore, since the suitability of the designed basic route can be judged more accurately, the route of the wire harness can be designed with higher accuracy.

According to the second aspect of the present invention, the shape of the attachment part and the interference object are combined and displayed, so that a more realistic wire harness path design is possible.

According to the third aspect of the present invention, it is possible to design a route that avoids the adverse effects of the vehicle door and body on the wire harness due to the vibrations peculiar to the vehicle. That is, it is possible to design the route of the vehicle wire harness with high accuracy.

According to the fourth and fifth aspects of the present invention, the variation range of the basic path between the restraining members based on the input path length of the basic path, the restraining position and restraining direction of the restraining member, and the minimum bending radius. Since this range is displayed in a three-dimensional manner, the suitability of the basic route can be easily determined as appropriate. Therefore, it is possible to design the wire harness path with high accuracy in a short period of time. Further, by using the minimum bending radius, it is possible to predict realistic variation without requiring complicated calculation. Further, a plurality of calculation points for calculating the variation range based on the two predicted paths closest to the restraining member are obtained, the outermost point of each predicted path with respect to these calculated points is calculated, and the proximity is calculated. Since the outermost points to be displayed are sequentially connected and displayed, the predicted variation range is displayed in a birdcage shape, and the visibility is good. Therefore, since the suitability of the designed basic route can be judged more accurately, the route of the wire harness can be designed with higher accuracy.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, a hardware configuration for realizing the variation prediction method will be described with reference to FIG. FIG. 1 is a block diagram showing an example of a hardware configuration for realizing the present invention.

  As shown in FIG. 1, in the present embodiment, a microcomputer (simply referred to simply as a microcomputer) 11, an input device 12, a display device 13, a printing device 14, a storage device 15, and a communication interface 16 are basically configured. A personal computer is used. The microcomputer 11 includes a CPU 11a (central processing unit), a ROM 11b that stores a boot program and the like, and a RAM 11c that temporarily stores various processing results. The input device 12 (corresponding to the input means in the claims) is a keyboard, a mouse or the like for inputting the above values, the display device 13 is an LCD or CRT or the like for displaying the processing results, and the printing device 14 is the processing results. Is a printer that prints. The storage device 15 is a hard disk drive that stores the installed variation prediction program 19a and the processing results of the program 19a. The communication interface 16 performs data communication with an external device using, for example, the Internet or a LAN line. For example, a modem board. The read / write device 17 reads a variation prediction program 19a (corresponding to claim 6) according to the present invention stored in a recording medium 19 such as a CD-ROM or a DVD-ROM, or a calculation result by the variation prediction program 19a. Is a device for writing to the recording medium 19. Each of these components is connected via an internal bus 18.

  The microcomputer 11 installs the variation prediction program 19 a read by the read / write device 17 in the storage device 15. In addition, after the power is turned on, the microcomputer 11 is activated according to the boot program stored in the ROM 11b and starts up the installed variation prediction program 19a. The microcomputer 11 performs processing related to variation prediction according to the present invention in accordance with the variation prediction program 19a, outputs the processing result from the display device 13 or the printing device 14, and stores the processing result in the storage device 15 or the recording medium. 19 to save. The variation prediction program 19a can be installed on another personal computer or the like having the above basic configuration, and after the installation, the computer is caused to function as a variation prediction device (corresponding to claim 5). The variation prediction program 19a may be provided not only via the recording medium 19 but also via a communication line such as the Internet or a LAN.

  Next, a processing procedure according to an embodiment of the variation prediction method of the present invention will be described with reference to FIGS. First, the basic processing procedure of this prediction method will be described with reference to FIGS. FIG. 2 is a flowchart showing a basic processing procedure according to an embodiment of the variation prediction method of the present invention. FIG. 3 (A) is a diagram showing a basic route, and FIGS. 3 (B) and 3 (C) are diagrams showing examples of display output by this prediction method.

  In Step S1 of FIG. 2, the basic route 1 of the wire harness is determined in consideration of the shape of the vehicle door and body to be routed, the presence of related electrical components, and the arrangement on the jig plate. Pre-designed. In this basic path 1, for example, it is assumed that at least two different points are restrained by a predetermined restraining member 2 as shown in FIG. In the wire harness, the restraining position and the restraining direction are defined by the restraining member 2. Examples of the restraining member 2 include a connector, a rotary clamp, and a fixed clamp. Here, it is assumed that a fixed clamp (or connector) is employed as the restraining member 2. Data indicating the basic route 1 designed in this way is stored in the storage device 15 prior to the subsequent processing, and the variation range for the basic route 1 is predicted in the subsequent processing procedure.

  Next, in step S <b> 2, a basic path length, a dimensional tolerance, a constraint position, a constraint direction, and a minimum bending radius are input to the basic path 1 using the input device 12. The basic path length is the line length of the basic path 1 between the two restraining members 2, and the dimensional tolerance is the maximum allowable tolerance that can normally occur for this basic path length. For example, if the basic path length is 200 mm, the dimensional tolerance is about ± 5 mm. The constraint position and the constraint direction are values that depend on the constraint member 2. The minimum bending radius is a kind of material characteristic of the wire harness that is a prediction target, and is also called a limit bending radius. This value can be obtained in advance by a test or the like. Each of these parameters is input by the input device 12 and given to the microcomputer 11.

  Next, in step S3, based on the data related to the basic route 1 stored in the storage device 15 and each input parameter, the variation prediction range of the basic route 1 is calculated by the microcomputer 11 and calculated in step S4. The predicted variation range is displayed on the display device 13. Alternatively, it is printed on paper by the printing device 14. The processing procedures of steps S3 and S4 will be described later with reference to FIGS. 4 and 7, respectively. In step S5, the variation prediction range may be displayed in a three-dimensional manner by combining with the attachment portion of the wire harness, an interference object, or the like. For example, as shown in FIGS. 3B and 3C, the variation prediction range 3 is combined with the attachment site 4 and displayed in a three-dimensional manner in a birdcage shape according to the shape of the basic route 1. Thus, since the variation prediction range is combined and displayed with the shape of the attachment portion 4, a more realistic wire harness route design is possible. Step S3 corresponds to a variation range calculation step and variation range calculation means in claims, and step S4 corresponds to a variation range display means. Further, step S5 corresponds to a composite display step in claims.

  Next, the variation prediction range calculation method will be described with reference to FIGS. FIG. 4 is a flowchart showing the variation prediction range calculation processing of FIG. FIG. 5 is a diagram illustrating a process of the variation prediction range calculation process of FIG. FIGS. 6A and 6B are diagrams for explaining the pitch angle used in the variation prediction range calculation process. Needless to say, the arithmetic processing related to the variation prediction range calculation is performed by the CPU 11 a of the microcomputer 11.

  First, in step S31 in FIG. 4, an actual path length that is the length of the actual path 1 ′ indicated by the dotted line in FIG. 5A is calculated. The actual path 1 ′ is a path having a line length (actual path length) obtained by adding the absolute value of the dimensional tolerance to the basic path 1.

Next, in step S32, as shown in FIG. 5B, the first calculation point p ₁ and the twentieth calculation point p ₂₀ are obtained based on the actual path length and the minimum bending radius. The first calculation point p ₁ and the twentieth calculation point p ₂₀ are like a reference point that becomes a start point and an end point for later-described calculation. The first calculation point p ₁ and the twentieth calculation point p ₂₀ are, for example, predicted paths l ₁ and l that satisfy the minimum bending radius at two locations among the actual paths 1 ′ that satisfy the minimum bending radius. _It is the peak point on ₂₀ . In the figure, reference number r indicates a circle corresponding to the minimum bending radius of the wire harness that is the object of calculation. Note that when obtaining the first calculation point p ₁ and the 20 calculation point p _20, as shown in FIG. 5 (B), there may be cases where the inflection point is more than two places.

Next, in step S33, a second calculation point p ₂ to a nineteenth calculation point p ₁₉ are obtained based on the first calculation point p ₁ and the twentieth calculation point p ₂₀ . These calculation points p _{2 to} p ₁₉ are, for example, points that equally divide the calculation points p ₁ and p ₂₀ . As described above, the calculation points p _{1 to} p ₂₀ can be obtained by steps S31 and S32. However, these calculation points may be points obtained by other methods. In short, what is necessary is just to be a plurality of relatively dispersed points on the path of the wire harness to be calculated. Steps S32 and S33 correspond to the calculation point acquisition step in the claims.

Next, in step S34, each outermost point E (θ _i , p _j ) is calculated. First, the pitch angle θ used when calculating each outermost point will be described with reference to FIG. The pitch angle θ is an angle for equally assigning the calculation points p _{1 to} p ₂₀ three-dimensionally around the path of the wire harness to be calculated. Specifically, as shown in FIG. 6A, first, two paths on the same plane that balance each other without applying force to the path between the restraining members 2 of the wire harness being calculated. l is obtained, and a virtual circle R having a diameter D between the outermost points of these two real paths l is obtained. Note that l ′ is an example of another path that satisfies the minimum bending radius to be calculated. Next, as shown in FIG. 6B, the center of the circle r is arranged on the circumference of the virtual circle R. Next, the center of the circle r adjacent to the point where the circle r and the virtual circle R intersect is arranged. An angle formed between these two circles r and the center of the virtual circle R is defined as a pitch angle θ. However, the maximum pitch angle θ is 15 degrees. The point at which one minute of such pitch angle theta intersects the virtual circle R and theta _1, two partial and theta _2, likewise, θ _23, ..., and theta _i. The reference point is θ ₀ . Here, for example, θ _{0 to} θ ₂₄ are assigned, but this may be another assignment method. In short, what is necessary is just to be a plurality of points such that the calculation points are equally allocated three-dimensionally around the route of the wire harness to be calculated.

Then, first, Figure 5 (C), the outermost point E corresponding to each calculation point p ₁ ~p ₂₀ in _{θ 0 (θ 0, p 1} ) ,. . . . , The outermost point E (θ ₀ , p ₂₀ ) is obtained, and the outermost points E (θ _i , p _j ) in θ ₁ to θ ₂₄ are sequentially calculated as shown in FIG. . In the figure, the outermost point E (θ ₀ , p ₁ ),. . . . , Outermost points E (θ ₀ , p ₂₀ ) are respectively E ₁ ,. . . . , E ₂₀ for simplicity. Also, the outermost point, each path _{l 1, ..., l 10,} ..., a peak point on the l _20. In this way, all outermost points corresponding to all calculation points p _{1 to} p ₂₀ at all angles θ _{0 to} θ ₂₄ are calculated. Step S34 corresponds to the outermost point calculation step in the claims.

  Furthermore, the variation prediction range display method will be described with reference to FIGS. FIG. 7 is a flowchart showing the variation prediction range display process of FIG. FIG. 8 is a diagram illustrating a process of the variation prediction range display process of FIG.

First, in step S41 of FIG. _{7, H 1, H 2,} H 3 in FIG. 8 (A), ..., as indicated by, respectively theta ₀ through? _24, the adjacent outermost points E (theta _i , P _j ) and the outermost point E (θ _i , p _{j + 1} ) are sequentially connected. It should be noted that the outermost points E ₁ and E ₂₀ and the two restraining members 2 are connected using a part of the path when the first calculation point and the twentieth calculation point are obtained. Next, in step S42, as shown by V ₁ , V ₂ , V ₃ ,... In FIG. 8B, adjacent outermost points E (θ _i , p, respectively) with respect to p ₁ to p ₂₀ . _j ) and the outermost point E (θ _{i + 1} , p _j ) are sequentially connected. In this way, finally, all adjacent outermost points E (θ _i , p _j ) are connected, and a narrow birdcage-like variation prediction range is displayed in three dimensions. Thus, since the expected variation range is displayed in a birdcage shape, the visibility is very good. Therefore, since the suitability of the designed basic route can be judged more accurately, the route of the wire harness can be designed with higher accuracy. Needless to say, the order of the processing procedures in steps S41 and S42 may be reversed. Further, it is not always necessary to connect all the outermost points E (θ _i , p _j ). For example, the outermost points that are close to each other may be connected to each other, so that an outline of the variation prediction range can be grasped. Is possible. Steps S41 and S42 correspond to a connection display step in claims.

  Such a variation prediction range may be displayed as shown in FIG. 3C, for example, by combining with the attachment part of the path of the wire harness to be calculated.

  As described above, according to the present embodiment, a method and an apparatus that can predict a variation range without requiring a complicated calculation by using a minimum bending radius and can design a path of a wire harness with higher accuracy are provided. Is done. In particular, the present method and apparatus are more effective when applied to route design of a vehicle wire harness.

  In addition, the method and apparatus of this invention are applicable also to the wire harness wired indoors. The calculation points and pitch angles exemplified in the above embodiment can also be changed. Further, the variation prediction result can be transmitted not only to the display device 13 and the printing device 14 but also to an external device using the communication I / F 16 and the LAN line. The present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist thereof.

It is a block diagram which shows an example of the hardware constitutions for implement | achieving this invention. It is a flowchart which shows the basic process sequence which concerns on one Embodiment of the variation prediction method of this invention. FIG. 3 (A) is a diagram showing a basic route, and FIGS. 3 (B) and 3 (C) are diagrams showing examples of display output by this prediction method. It is a flowchart which shows the variation prediction range calculation process of FIG. It is a figure which shows the process of the variation prediction range calculation process of FIG. FIGS. 6A and 6B are diagrams for explaining the pitch angle used in the variation prediction range calculation process. It is a flowchart which shows the variation prediction range display process of FIG. It is a figure which shows the process of the variation prediction range display process of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Basic path | route 2 Restraint member 3 Variation estimation range 4 Attachment part 11 Microcomputer 12 Input device 13 Display device 14 Printing device 15 Storage device 16 Communication interface 17 Internal bus

Claims (5)

To pre-designed basic route of a wire harness to be routed in a predetermined site, the wire harness the wire harness after being routed in the predetermined portion, which is generated due to the dimensional tolerances or constraints methods like of the wire harness A method of predicting a variation range indicating a variation or a displacement range with respect to the basic path of
The length of the actual path including a dimensional tolerance in the basic path located between the two restraining members based on the restraining positions and restraining directions of the two restraining members that restrain at least two different points in the basic path. Calculating a path length indicative of
Based on the path length and the minimum bending radius of the wire harness, calculate two predicted paths where the bent part of the actual path is the minimum bending radius and the bent part is closest to the two restraining members, A calculation point for obtaining a start point and an end point based on each bending portion of the predicted path, and for calculating a plurality of calculation points including the start point and the end point and dividing the start point to the end point to calculate the variation range. Acquisition process;
An outermost point calculation step of calculating an outermost point of each of a plurality of predicted paths that become a peak point when each of the plurality of calculation points is bent at the minimum bending radius;
And a variation range calculation step for calculating the variation range between the two restraining members,
A display step of three-dimensionally displaying the variation range, including a connection display step of sequentially connecting and displaying the outermost points that are close to each other among the plurality of outermost points obtained in the outermost point calculation step; When,
A method for predicting variation in a wire harness, comprising: In the variation prediction method of the wire harness of Claim 1 ,
A combined display process that combines and displays the shape of the attachment site and interference.
The wiring harness variation prediction method further comprising: In the variation prediction method of the wire harness according to claim 1 or 2 ,
The wire harness is routed to a vehicle door or body,
A variation prediction method for a wire harness, characterized by: To pre-designed basic route of a wire harness to be routed in a predetermined site, the wire harness the wire harness after being routed in the predetermined portion, which is generated due to the dimensional tolerances or constraints methods like of the wire harness A device for predicting and outputting a variation range indicating a variation or a displacement range with respect to the basic path of
Input means for inputting the path length of the basic path including the dimensional tolerance, the respective restraining positions and restraining directions of two restraining members that restrain at least two different points in the basic path, and the minimum bending radius of the wire harness; ,
Means for calculating a path length indicating a length of an actual path including a dimensional tolerance in the basic path located between the two constraint members based on the constraint position and the constraint direction;
Based on the path length and the minimum bending radius of the wire harness, calculate two predicted paths where the bent part of the actual path is the minimum bending radius and the bent part is closest to the two restraining members, A calculation point for obtaining a start point and an end point based on each bending portion of the predicted path, and for calculating a plurality of calculation points including the start point and the end point and dividing the start point to the end point to calculate the variation range. Acquisition means;
Outermost point calculation means for calculating the outermost point of each of a plurality of predicted paths that are peak points when each of the plurality of calculation points is bent at the minimum bending radius;
And a variation range calculation means for calculating the variation range between the two restraining members,
Of the plurality of outermost points obtained in the outermost point calculation step, the outermost points adjacent to each other are sequentially connected and displayed, and the calculation is performed by the variation range calculation unit. A variation range display means for three-dimensionally displaying the variation range;
An apparatus for predicting fluctuations in a wire harness, comprising: To pre-designed basic route of a wire harness to be routed in a predetermined site, the wire harness the wire harness after being routed in the predetermined portion, which is generated due to the dimensional tolerances or constraints methods like of the wire harness In order to predict and display a variation range indicating a variation or a displacement range with respect to the basic path of the computer,
Input means for inputting the path length of the basic path including the dimensional tolerance, the respective restraining positions and restraining directions of two restraining members that restrain at least two different points in the basic path, and the minimum bending radius of the wire harness;
Means for calculating a path length indicating a length of an actual path including a dimensional tolerance in the basic path located between the two constraint members based on the constraint position and the constraint direction;
Based on the path length and the minimum bending radius of the wire harness, calculate two predicted paths where the bent part of the actual path is the minimum bending radius and the bent part is closest to the two restraining members, A calculation point for obtaining a start point and an end point based on each bending portion of the predicted path, and for calculating a plurality of calculation points including the start point and the end point and dividing the start point to the end point to calculate the variation range. Acquisition means;
Outermost point calculation means for calculating the outermost point of each of a plurality of predicted paths that are peak points when each of the plurality of calculation points is bent at the minimum bending radius;
And a variation range calculation means for calculating the variation range between the two restraining members,
Of the plurality of outermost points obtained in the outermost point calculation step, the outermost points adjacent to each other are sequentially connected and displayed, and the calculation is performed by the variation range calculation unit. Function as a variation range display means for three-dimensionally displaying the variation range;
A wiring harness variation prediction program characterized by that.

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